Explanation:

- Social Costs: These are the total costs to society, including both private and external costs. They consider the broader impact of an economic activity on the community and environment.

- Opportunity Costs: The cost of choosing one alternative over another, essentially the benefit you miss out on by not selecting the next best option.

- Money Costs: The actual monetary expenditure incurred in acquiring factor services, such as wages paid for labor, rent for land, and interest for capital.

- Real Costs: These refer to the physical effort, time, and resources used in producing goods or services, not just the financial outlay.

- Correct Answer: Money costs